// Press Shift twice to open the Search Everywhere dialog and type `show whitespaces`,
// then press Enter. You can now see whitespace characters in your code.
public class Main {
    public static void main(String[] args) {
        CPU cpu = new CPU();
        cpu.speed=100;
        HardDisk hardDisk = new HardDisk();
        hardDisk.amount = 100000000;
        PC pc = new PC();
        pc.setCPU(cpu);
        pc.setCPU(cpu);
        pc.setHarDisk(hardDisk);
        pc.show();
    }
}